/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.rest.service.api.history;

import org.activiti.engine.ActivitiObjectNotFoundException;
import org.activiti.engine.HistoryService;
import org.activiti.engine.TaskService;
import org.activiti.engine.history.HistoricProcessInstance;
import org.activiti.engine.task.Comment;
import org.activiti.rest.service.api.RestResponseFactory;
import org.activiti.rest.service.api.engine.CommentResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


/**
 * @author Frederik Heremans
 */
@RestController
public class HistoricProcessInstanceCommentResource {

    @Autowired
    protected RestResponseFactory restResponseFactory;

    @Autowired
    protected HistoryService historyService;

    @Autowired
    protected TaskService taskService;

    @RequestMapping(value = "/history/historic-process-instances/{processInstanceId}/comments/{commentId}", method = RequestMethod.GET, produces = "application/json")
    public CommentResponse getComment(@PathVariable("processInstanceId") String processInstanceId,
                                      @PathVariable("commentId") String commentId, HttpServletRequest request) {

        HistoricProcessInstance instance = getHistoricProcessInstanceFromRequest(processInstanceId);

        Comment comment = taskService.getComment(commentId);
        if (comment == null || comment.getProcessInstanceId() == null || !comment.getProcessInstanceId().equals(instance.getId())) {
            throw new ActivitiObjectNotFoundException("Process instance '" + instance.getId() + "' doesn't have a comment with id '" + commentId + "'.", Comment.class);
        }

        return restResponseFactory.createRestComment(comment);
    }

    @RequestMapping(value = "/history/historic-process-instances/{processInstanceId}/comments/{commentId}", method = RequestMethod.DELETE)
    public void deleteComment(@PathVariable("processInstanceId") String processInstanceId,
                              @PathVariable("commentId") String commentId, HttpServletRequest request, HttpServletResponse response) {

        HistoricProcessInstance instance = getHistoricProcessInstanceFromRequest(processInstanceId);

        Comment comment = taskService.getComment(commentId);
        if (comment == null || comment.getProcessInstanceId() == null || !comment.getProcessInstanceId().equals(instance.getId())) {
            throw new ActivitiObjectNotFoundException("Process instance '" + instance.getId() + "' doesn't have a comment with id '" + commentId + "'.", Comment.class);
        }

        taskService.deleteComment(commentId);
        response.setStatus(HttpStatus.NO_CONTENT.value());
    }

    protected HistoricProcessInstance getHistoricProcessInstanceFromRequest(String processInstanceId) {
        HistoricProcessInstance processInstance = historyService.createHistoricProcessInstanceQuery()
                .processInstanceId(processInstanceId).singleResult();
        if (processInstance == null) {
            throw new ActivitiObjectNotFoundException("Could not find a process instance with id '" + processInstanceId + "'.", HistoricProcessInstance.class);
        }
        return processInstance;
    }
}
